Electrical
Van Battery Keeps Dying — Common Causes and Fixes
A battery that repeatedly goes flat may be caused by a failing alternator, parasitic drain, short journeys, or an old battery past its useful life.
If your van battery dies repeatedly, the root cause is not always the battery itself. A failed alternator will not charge the battery while driving, leaving it flat after a short journey. Parasitic drain — where a component like a glovebox light, radio, or aftermarket tracker continues to draw power with the ignition off — can flatten a healthy battery overnight. Frequent short journeys prevent the battery from fully recharging after starting. Cold weather also reduces battery capacity. A garage can test the battery, alternator output, and parasitic drain to identify the real culprit.
Key takeaways
- Test the battery and alternator output before assuming the battery is faulty
- Parasitic drains from electrical components can flatten a battery overnight
- Short journeys prevent full recharging and shorten battery life over time
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